Rate constants for reactions of singlet oxygen with phenols and other compounds in water |
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| Institution: | 1. Swiss Federal Institute for Water Resources and Water Pollution Control (EAWAG), 8600 Dübendorf, Switzerland;2. Guest Scientist from Department of Chemical Sciences, Old Dominion University, Norfolk, V.A. 23508-8559, USA;1. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China;2. School of Geography and Environment, Jiangxi Normal University, No. 99, Ziyang Road, Nanchang 330022, China;3. Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, No. 99, Ziyang Road, Nanchang 330022, China;4. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China;2. National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, China;3. College of Historical Culture and Tourism, Sichuan Normal University, Chengdu 610068, China |
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| Abstract: | Rate constants for some environmentally important organic model compounds reacting with singlet oxygen in water have been determined in laboratory experiments using rose bengal as a sensitizer. Dimethylfuran, furfuryl alcohol, 2,3-dimethyl-2-butene and diethylsulfide react about three times faster in water than in non-aqueous solutions. Phenolic compounds react faster at higher pH values. Their rate constants exactly increase with their degree of dissociation. Rate constants for the ionized species of these phenolic compounds are greater than 108M−1s−1. In natural surface water under solar irradiation reaction with singlet oxygen is important only for a few classes of especially reactive organic compounds. |
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